GE T35, Инструкция по эксплуатации

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CHAPTER 5: SETTINGS PRODUCT SETUP
T35 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL 5-115
5
Oscillography records contain waveforms captured at the sampling rate as well as other relay data at the point of trigger.
Oscillography records are triggered by a programmable FlexLogic operand. Multiple oscillography records can be captured
simultaneously.
When EnerVista UR Setup creates a new settings file, a Smart defaults feature automatically enters a basic oscillography
configuration. The basic configuration changes the factory default values to make the number of samples per cycle 32,
adds a selection of digital and analog channels that are often of interest, and adds a FlexLogic equation to trigger
oscillography. Review and update this basic configuration as required for the application at hand.
The
NUMBER OF RECORDS
is selectable, but the number of cycles captured in a single record varies considerably based on
other factors, such as sample rate and the number of operational modules. There is a fixed amount of data storage for
oscillography; the more data captured, the less the number of cycles captured per record. See the
ACTUAL VALUES

RECORDS  OSCILLOGRAPHY
menu to view the number of cycles captured per record. The following table provides sample
configurations with corresponding cycles/record. The minimum number of oscillographic records is three.
Table 5-13: Oscillography cycles/record example
TRIGGER MODE
— A new record automatically overwrites an older record when
TRIGGER MODE
is set to “Automatic
Overwrite.”
TRIGGER POSITION
— Set this to a percentage of the total buffer size (for example, 10%, 50%, 75%, and so on). A trigger
position of 25% consists of 25% pre- and 75% post-trigger data.
TRIGGER SOURCE
— Always captured in oscillography and can be any FlexLogic parameter (element state, contact input,
virtual output, and so on). The relay sampling rate is 64 samples per cycle.
AC INPUT WAVEFORMS
— Determines the sampling rate at which AC input signals (that is, current and voltage) are stored.
Reducing the sampling rate allows longer records to be stored. This setting has no effect on the internal sampling rate of
the relay, which is always 64 samples per cycle. That is, it has no effect on the fundamental calculations of the device.

TRIGGER SOURCE:
Off
Range: FlexLogic operand

AC INPUT WAVEFORMS:
16 samples/cycle
Range: Off; 8, 16, 32, 64 samples/cycle

 DIGITAL CHANNELS

See below


ANALOG CHANNELS

See below
Records CT/VTs Sample rate Digital
channels
Analog
channels
Cycles per
record
3 1 32 32 16 2399
3 1 64 32 16 1450
16 1 32 32 16 666
16 1 64 32 16 402
32 1 32 32 16 352
32 1 64 32 16 213
3 2 32 32 16 1516
3 2 64 32 16 851
16 2 32 32 16 421
When changes are made to the oscillography settings, all existing oscillography records are cleared.